As with any medical imaging test, there is a small amount of radiation exposure associated with a CT angiography. The contrast dye used can also cause some people to experience allergic reactions or kidney problems, so patients should inform their doctor if they have a history of either. Additionally, if the test reveals significant blockages or narrowing in the arteries supplying the chest area, the patient may need further testing or treatment to reduce their risk of complications such as heart attack or stroke.